/*	$OpenBSD: uname.c,v 1.19 2016/10/28 07:22:59 schwarze Exp $	*/

/*
 * Copyright (c) 1994 Winning Strategies, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Winning Strategies, Inc.
 * 4. The name of Winning Strategies, Inc. may not be used to endorse or
 *    promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "compat.h"
#include <sys/param.h> /* MACHINE_ARCH */
#include <sys/utsname.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static void usage(void);

#define PRINT_SYSNAME 0x01
#define PRINT_NODENAME 0x02
#define PRINT_RELEASE 0x04
#define PRINT_VERSION 0x08
#define PRINT_MACHINE 0x10
#define PRINT_ALL 0x1f
#define PRINT_MACHINE_ARCH 0x20

int main(int argc, char *argv[]) {
  setprogname(argv[0]);
  struct utsname u;
  int c;
  int space = 0;
  int print_mask = 0;

  while ((c = getopt(argc, argv, "amnrsvp")) != -1) {
    switch (c) {
      case 'a':
        print_mask |= PRINT_ALL;
        break;
      case 'm':
        print_mask |= PRINT_MACHINE;
        break;
      case 'n':
        print_mask |= PRINT_NODENAME;
        break;
      case 'p':
        print_mask |= PRINT_MACHINE_ARCH;
        break;
      case 'r':
        print_mask |= PRINT_RELEASE;
        break;
      case 's':
        print_mask |= PRINT_SYSNAME;
        break;
      case 'v':
        print_mask |= PRINT_VERSION;
        break;
      default:
        usage();
    }
  }

  if (optind != argc) usage();

  if (!print_mask) print_mask = PRINT_SYSNAME;

  if (uname(&u) == -1) err(1, NULL);

  if (print_mask & PRINT_SYSNAME) {
    space++;
    fputs(u.sysname, stdout);
  }
  if (print_mask & PRINT_NODENAME) {
    if (space++) putchar(' ');

    fputs(u.nodename, stdout);
  }
  if (print_mask & PRINT_RELEASE) {
    if (space++) putchar(' ');

    fputs(u.release, stdout);
  }
  if (print_mask & PRINT_VERSION) {
    if (space++) putchar(' ');

    fputs(u.version, stdout);
  }
  if (print_mask & PRINT_MACHINE) {
    if (space++) putchar(' ');

    fputs(u.machine, stdout);
  }
  if (print_mask & PRINT_MACHINE_ARCH) {
    if (space++) putchar(' ');

    fputs(u.machine, stdout);
  }
  putchar('\n');

  return 0;
}

static void usage(void) {
  fprintf(stderr, "usage: %s [-amnprsv]\n", __progname);
  exit(1);
}
